Challenge Math Challenge - July 2019

[nuuskur]

Hey, I was lazy: "<" is on the keyboard $"\leq"$ is not. These details are trivial and left to the reader ;-)

That reminds me of a statistics course lecture. The lector said something like "..and since $f$ is injective, it is invertible..". Similarly, in algebra, saying something is a subgroup of $G$ is to be read as "is an isomorphic copy of a subgroup of $G$".

 

[fresh_42]

That reminds me of a statistics course lecture. The lector said something like "..and since $f$ is injective, it is invertible..". Similarly, in algebra, saying something is a subgroup of $G$ is to be read as "is an isomorphic copy of a subgroup of $G$".

or omitting "almost everywhere" in measure theory.

I have also seen isomorphic for monomorphic (here, not in books), which I really dislike.